01 nitration of of Unknown Diprotic cid Worksheet Results Table 1. Data from tit

Question

01 nitration of of Unknown Diprotic cid Worksheet Results Table 1. Data from titration curve for unknown diprotic acid Point on Titration Curve Volume of Na added to pH of solution reach this point (mL) 1st half-equivalence point 2, ist equivalence point 2nd half-equivalence point 13.5 2nd equivalence point 37 9, CSS Attach a copy of the titration curve obtained in lab. The figure should have a descriptive title with the half equivalence points and axes label Discussion State the identity of your unknown acid and explain the rationale behind your assignment of the unknown's identity. to include calculation(s) to support your explanation.

Explanation / Answer

You have provided incorrect data.

The volume of base added at the 2nd half equivalence point should be 28.5 mL, and not 18.5 mL

Now,

pH at first half equivalence point = pKa1 = 2.14

pH at second half equivalence point = pKa2 = 4.04

From the data provided for the acids, we see that for oxalic acid,

pKa1 = 1.23 and pKa2 = 4.18

And, for maleic acid:

pKa1 = 1.82 and pKa2 = 6.07

Oxalic acid seems to have the data with better consistency, so answer is oxalic acid

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